發(fā)布時(shí)間：2018-03-24 02:07

  本文選題：多跨連續(xù)梁橋　切入點(diǎn)：減隔震　出處：《中南大學(xué)》2014年碩士論文

【摘要】：多跨連續(xù)梁橋縱、橫向地震響應(yīng)具有一定的差異,使用一種減隔震裝置難以達(dá)到水平兩個(gè)方向同時(shí)減隔震的目的。鉛芯橡膠支座在蠕變荷載作用下水平抗力很小,而在地震強(qiáng)烈動(dòng)荷載作用下屈服后剛度迅速降低,同時(shí)支座滯回耗散地震能量；液體粘滯阻尼器是速度相關(guān)型耗能裝置,提供構(gòu)件強(qiáng)大的恢復(fù)力,具有良好的限位功能。將兩者共同使用,可以有效的同時(shí)控制多跨連續(xù)梁橋水平兩個(gè)方向的地震響應(yīng)�；谶@種思路,本文以某高速多跨連續(xù)梁橋?yàn)楣こ瘫尘?主要完成了以下工作： 1、結(jié)合對(duì)橋梁抗震設(shè)計(jì)、計(jì)算方法的回顧、對(duì)比,闡述了鉛芯橡膠支座以及液體粘滯阻尼器的減隔震原理、力學(xué)性能、適用情況以及計(jì)算中的實(shí)現(xiàn)方法。 2、利用有限元分析軟件ANSYS建立了某高速五跨連續(xù)梁橋的分析模型,并對(duì)其進(jìn)行了動(dòng)力特性分析。 3、利用動(dòng)力時(shí)程分析方法,對(duì)鉛芯橡膠支座以及液體粘滯阻尼器的減隔震效果進(jìn)行探討,并對(duì)鉛芯橡膠支座的設(shè)計(jì)參數(shù)對(duì)多跨連續(xù)梁橋減隔震效果的影響進(jìn)行了分析。 4、運(yùn)用基于能量的分析方法,探討了鉛芯橡膠支座以及液體粘滯阻尼器對(duì)多跨連續(xù)梁橋橋墩地震動(dòng)輸入能的影響,并推到了一種基于能量方法的橋墩地震安全系數(shù)。 5、利用多跨連續(xù)梁橋減隔震效果模擬試驗(yàn),驗(yàn)證了LRB與FVD組合應(yīng)用減隔震效果的可行性。
[Abstract]:The longitudinal and lateral seismic responses of multi-span continuous beam bridges are different, so it is difficult to achieve the aim of both horizontal direction and simultaneous isolation by using a kind of isolation device. The horizontal resistance of lead rubber bearing is very small under creep load. The stiffness decreases rapidly after yielding under strong earthquake dynamic load, and the support hysteresis dissipates the seismic energy, and the liquid viscous damper is a speed dependent energy dissipation device, which provides a strong restoring force of the component. It can effectively control the seismic response of multi-span continuous beam bridge in horizontal and two directions simultaneously. Based on this idea, a high-speed multi-span continuous beam bridge is used as the engineering background in this paper. The following tasks have been completed:. 1. According to the retrospect of the seismic design and calculation method of the bridge, the principle, mechanical performance, application and realization method of the lead-rubber bearing and liquid viscous damper are expounded. 2. The analysis model of a high-speed five-span continuous beam bridge is established by using the finite element analysis software ANSYS, and its dynamic characteristics are analyzed. 3. Using dynamic time history analysis method, the seismic isolation effect of lead rubber bearing and liquid viscous damper is discussed, and the influence of design parameters of lead rubber bearing on the seismic isolation effect of multi-span continuous beam bridge is analyzed. 4. The influence of lead rubber bearing and liquid viscous damper on the input energy of ground motion of piers of multi-span continuous girder bridge is discussed by using the energy-based analysis method, and the seismic safety factor of the pier based on the energy method is deduced. 5. The feasibility of the application of LRB and FVD is verified by using the simulation test of seismic isolation effect of multi-span continuous beam bridge.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U442.55

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